I had the same problem--rats--dirt floor and even with the board walls well under the dirt floor they dug under--I put the one bite poison out in the rest of the barn --remembering where--and kept the girls penned up for a couple of days--two days later the poison was all gone and the only rat I seen was a dead one in the field beside the barn--the dog wasn't even interested in it...no more rats for now--they will be back --eventually--and hopefully my new coop 3 ft. off the ground will be done by then!!!!! I stuck it on places like under the mower deck on the mower and behind stuff against the walls that nothing else could get into.....